function createStyle(text)
{
  var style= document.createElement('style');
  style.innerHTML = text;
  document.getElementsByTagName("head")[0].appendChild(style);
}

createStyle("td.wsqti_item_icon_f \
{ \
width: 8px; \
height: 14px; \
border: solid 1px #666; \
background-color: #999; \
background-image: url(http://tutor.cft.ru/webtutor/11.2.25/1/images/bg_scale_red_16.gif); \
background-repeat: repeat-x; \
margin-right: 2px; \
cursor: pointer; \
} \
 \
td.wsqti_item_icon_c \
{ \
width: 8px; \
height: 14px; \
border: solid 1px #666; \
background-color: #999; \
background-image: url(http://tutor.cft.ru/webtutor/11.2.25/1/images/bg_scale_green_16.gif); \
background-repeat: repeat-x; \
margin-right: 2px; \
cursor: pointer; \
} \
 \
td.wsqti_item_icon_n \
{ \
width: 8px; \
height: 14px; \
border: solid 1px #666; \
background-color: #999; \
background-image: url(http://tutor.cft.ru/webtutor/11.2.25/1/images/bg_scale_gray_16.gif); \
background-repeat: repeat-x; \
margin-right: 2px; \
cursor: pointer; \
} \
 \
td.wsqti_item_icon_i \
{ \
width: 8px; \
height: 14px; \
border: solid 1px #666; \
background-color: #999; \
background-image: url(http://tutor.cft.ru/webtutor/11.2.25/1/images/bg_scale_yellow_16.gif); \
background-repeat: repeat-x; \
margin-right: 2px; \
cursor: pointer; \
}");